Attachment for sewing machines



A. B. MATTINGLY ATTACHMENT FOR SEWING MACHINES Sept. 11,1923:

Original Filed Nov. 7, 1919 6 Sheets-Sheei 1 VIII/[11]!!!IIIIIIIIIII/IIIIflIlI/IIIIIIIIlllllllllllllfla} Sept 1 1 1923.

A. B. MATTINGLY ATTACHMENT FOR SEWING MACHINES Original Filed Nov. '7 5 sh t -she t, 2

$ept. 11,1923. mamas A. B. MATTENGLY ATTACHMENT FOR SEWING MACHINES Original Filed Novf 7 1919 s 51 5 Sept. 11,1923, M67866 A. B. MATTINGLY I ATTACHMENT FOR SEWING MACHINES Original Filed Nov. '7, 1919 6 Sheets-Sheet 4 11 1923. 1&531866 A. B. MATTINGLYw ATTACHMENT FOR SEWING MACHINES Sept.

Original Filed Nov. 7, 1919 5 s t .5 s

ventorx A. B. MATTINGLY ATTACHMENT FOR SEWING MACHINES Se t; 11 1%23. HAWBM Original Filed Nov. 7, 1919 6 Sheets-Sheet 6 fizz/wafer.

Patented Sept. 11, 1923.

ALBERTUS B. MATTINGLY, OF NEW YORK, .cl'. Y.

ATTACHMENT FOR SEWENG lVXACHINESW Application filed November 7, 1919, Serial No. 336,257.

To (ZZZ whom it may concern."

Be it known that I, ALBnRTUs B. MAT- TINGLY, a citizen of the United States, and resident of New York, in the county of New York and State of New York, have invented certain new and useful Improvements in Attachments for Sewing Machines, of which the following is a specification.

This invention relates'to an improvement in attachments for sewing machines, and the inventor is aware that the device is of a nature similar to that disclosed in British Letters Patent No. 17,153 of 1905, to Hills, and United States Patents No. 412,081, to Fletcher, No. 446,736, to Fletcher, No. 990,601, to Seward, and No. 900,610, to Turck, and the object is to overcome some of the objectionable features of these devices and to further improve the same.

The principal objects are to provide a device of this character to automatically cut or slit the cloth just in advance of the stitching or binding of the button-hole so that the needle may pass alternately through the cloth and then through the slit or cut, thus causing the thread to be brought through the cut and make a perfect binding of the raw edges of the work, and to provide a means for positively actuating the knife wit-h a quick and decisive action at the proper periods to make the cut the proper length according to the length of the button-holes, and to have the length of cut automatically adjust itself with the adjusting of the device for the length of the button-hole.

The further objects are to provide a device of this character which will provide a means for more evenly distributing the stitches around the contour-of the buttonhole than has heretofore been accomplished, and to provide a means whereby a more perfect adjustment of the cutting device as regards it al-inement relative to the needle of the sewing machine is obtained.

The still further objects are to provide a device of this character which by its construction is considerably reduced in height and thereby doing away with the necessity of removing the face plate of the sewing machine to adjust the presser bar, and by the construction of the base plate obviatingthe necessity of removing the feed dogs of the sewing machine.

The still further objects are to provide an improved ratchet device for effecting the Renewed February 12, 1923.

lateral vibration of the work clamp, to produce the overstitch of the edge of the buttonhole, and to form other parts of the device by the stamping process, screw machines, which is the cheapest method of manufacturing. devices of this class.

A still further object is to provide a device of this kind inWhich the knife can be adjusted to cut a line or slit in which the needle will follow with its inside lines of its vibrating motion on its forward movement and also perform the same function on its backward movement in forming or stitching the button-hole.

With these and other objects in View, it will be seen that I accomplish the foregoing, by referring to the accompanying drawings forming apart of this specification; but I do not wish to confine myself to the exact construction shown, as I have, for the sake of clear illustration, exaggerated some of the parts, especially in the side elevations, and the cam faces of the yoke upon which the eccentric cam works.

In the accompanying drawings, showing one embodiment of my invention, Figure 1 is a plan. view of the device; Fig-2 is a similar view to Fig. 1, partly broken away to show the revolving disk and the cam for moving the work clamp; Fig. 3 is a similar view to Fig. 2,with the revolving disk removed; 4 is a similar view to Fig. 3 and a section taken on line 414 of Fig. 5; Fig. 5 is a side elevation; Fig. 6 is a sectional View taken on the line 66 of Fig. 5; Fig. 7 is a similar view to Fig. 6, with the knife and its operating means removed; Fig. 8 is a similar View to Fig. 7, with the work clamp removed showing the vibrating means; Fig. 9 is a similar view to F ig. 8, with the vibrating means removed; Fig. 10 is a central sectional view; Fig. 11 is a perspective piew of the operating lever; Fig. 12 is a detail plan of the vibrator; Fig. 13 is an end elevation of the vibrator; Fig. 14; is a side elevation of the vibrator; Fig. 15 is a perspective view of the vibrator carrier; Fig. 16 is a plan of the supporting plate; Fig. 17 is a bottom plan of the revolving disk; Fig. 18 is a central section of the revolving disk; Fig. 19 is a plan of the camming plate; Fig. 20 is a side elevation of the camming plate; Fig. 21 is a plan of the knife carrier; Fig. 22 is a side elevation of the knife carrier;-Fig. 23 is a plan of the knife shield and integral therewith the stripper plate for the needle and the guide for the work clamp; Fig. 24 isa side elevation of Fig. 23; Fig. is a plan of the work clamp; Fig. 26 is a plan of the ratchet cam; Fig. 27 is section of the ratchet cam; Fig. 28 is a plan of the pawl plate of the vibrator; Fig. 29 is a. plan of the spring pawl for operating the ratchet cam; Fig. is a. bottom plan of the cam member showing the cam for operating the knife and the race cam for controlling the work clamp; Fig. 31 is a. plan of the upper portion of the assembling studcarrying the brake springs; Fig. 32 is a side elevation of Fig. '31; Fig. 33 is a planof the lower portion of the l assembling stud and Fig. 34 is a side elevation of Fig. 33; Fig. 35 is a plan of the linkage for alining the work clamp and knife with the needle; Fig. 36 is a diagrammatic view showing the movement of the work clamp and cam when the operating cam moves in a circular motion; Fig. 37 is a view similar to Fig. 36, but showing the cam moving in an elliptical path.

I provide a suitable base plate 1, which .is secured to a rear throat plate 2 of the sewing machine in any suitable manner, but preferably screwed thereto, as shown in Fig. 1 of the drawings.

The base plate 1 is provided with an ear 3, which is upwardly turned and carries the operating lever 4, which rocks on a pivot 5 formed of a large screw, the lever 4 being provided with a bifurcated end 6, which engages the shank of the screw of the tightening collar of the needle bar of the sewing machine. The lever 4 is further providedwith an arc shaped slot 7, through which passes the arm of the friction clutch, which receives its'movement from the screw 8 in the ear 9 and the rear endi 10 of the slot 7. The screw 8 is friction-ally held from turning by the pressure of the spring 11 against its head and the ear 9. The'lever 4 is further provided wi than arm or downward extension which has a bifurcated end 12 which operates the pawl 13 and the p-awl plate 14 by the lever 15, which is mounted on the throat plate 2 by means of a body screw forming a piv0t16. In the forward end of the lever 15 is a pin 17 (see Figs. 9, 28 and] 29) which operates the pawl 13 and the pawl plate 14 through the slots 18 and 19.

The base plate 1 is further provided with a pivot or stud 20 made up of two parts 21 and 22. The lower portion 21 of the stud is hollow and has its upper and lower ends turned. down, leaving a body portion 23 which is slotted on opposite sides forming grooves 24 for the reception of the extensions 25 of the part 22, and a washer 26is forced on to the lower part of the part 21. The washer 26 forms a. substantial base for holding the stud in. a vertical position on the base plate, which is done by the screw 27 passing through the washer and the base plate 1 and the hollow part 21 and being screwed into the part 22, which looks all of the several parts assembled on the stud in position by its head 28, in which are secured two springs- 29 which act as friction breaks in connection with the cam member 30, which is driven by a frie tion device (see Figs. 4 and 10) composed of a friction ring 31 supported by a flange 32 on the cam member 30; in the recess 33 of the ring is pivoted a friction dog 34, which is normally held in contact with cam member 30 by a. spring 35. The lever 36 of the dog passes through an opening or slot 7 in the operating lever 4 and is: operated by the screw and the rear end of the slot 7, the screw 8 forcing the dog and ring backwards and relieving the pressure on the cam member. The springs 29 hearing against the surface 37 prevent the cam member from turning, and the rear end of the slot forces the dog forward and causes the nose 38 to bite or grip the surface 39 of the cam member 30 and revolve the same a predetermined amount, which is regulated by the screw 8. The plate 40 secured to the cam 30 keeps the ring in position.

Rotatably mounted upon the stud 20 and supported by the washer 26 are the pawl 13 and the pawl plate 14 (which are swung in an are by the end. 12 of the lever 4 through the lever 15 and its pin 17, in a forward and backward movement). Rotatably mounted upon the stud 20 and rest ing upon the pawl plate 14 isa ratchet cam 41 which receives a step by step rotary movement from the upturned end 138' of pawl 13 extending through a slot in plate 14, and engaging in turn the notches 137 of ratchet cam 41, and which operates the vibrator 56, which has its. support on the pawl plate and is pivoted on the pin 51o'f the L-shaped member 52.-

The base plate 1 is further provided with a cut-away portion 43 in which is located a. linked member 44 having a slot 45 and a circular opening 46 which fits the head of the screw 27 which acts as a pivot. Secured to the forward end of the linked member 44 by a pivot is a link 47 with an upturned end 48, which is tapped for the screw 49 which passes through a hole in the ear 3 and is provided wit-h a. lock nut 50. By'turning the screw 49 to pull or push the link 47, the slot 45 can be made to line up perfectly with the needle and the stud 20 and held in this position by the lock nut 50. The slot 45 is for receiving the bottom end of the pin 51 of the L-shaped member 52, which is provided with a slot 53 for adjusting it upon the base plate 1 by the screw 54, and it is provided with an upturned car 55 for adjusting it while the screw 5 1 is loose. The pin 51 is tight in the member 52 and its upper'end forms a pivot for the vibrator 56. which is connected thereto by the hole 57 in the ear 58, and when assembled the ear 58 is capable of passing under the pawl 13 and pawl plate 14, while the yoke 59 straddles the ratchet cam "and rests upon the pawl plate 14.

The vibrato-r 56 is provided with a pivoted block 60 which fits the inner faces of the rear yoke 62 of the work clamp 68, which straddles the stud 20 and rests on the supporting plate 61, which, working in conjunction with the cam member 30, keeps the forward part st of the work clamp in proper contact with the base plate 1 and prevents the bottom stripper plate 65 from leaving the slotted way 66 in the base as it is oscillated by the work clamp in con nection with the cars 67.

The supporting plate 61 is held in position by resting on the shoulders 68 of the bottom part of the stud 21, which fits the hole 69 provided with slots through which pass the extensions 25 of the upper part 22 of the stud 20 and prevent it from turning and causing the springs 29 to act as friction brakes on the cam member 30, for which the upper part acts as a journal. The screw 27 pulling down on the part 22 pinches the plate 61 between the shoulder 68 and the part 70 of the upper part 22 0f the stud.

Mounted upon the yoke 62 is the guide or shield 71 for the knife carrier 72, having its front end 73 in the form of a stripping plate which slides in a groove or space 74 formed by a plate 75, which is forced into the upper jaw 7 6 of the Work clamp. The rear end of the shield 71 is enlarged, form ing a yoke 77 which rests on the yoke 62. The yoke 77 is provided with an ear 77 by which it is pivotally connected to a sliding member 78, which is provided with a rectangular openingv 7 9 (see Fig, 6). The sides of the upper part 22 of the stud 20 are flattened so as to fit the sides of the opening 79 and form a guide or bearing for the member 78 and cause it to move in a straight right angle line relative to the stud and needle when operated by the pin 80 work-.

ing in the cam groove 81 formed by the cams S2 and 83 on the under side of cam 30 (thus causing the vibrator to vibrate or 0scillate the work clamp in the contour of a button-hole while the revolving disk is moving the work clamp back and forth the length of the button-hole). It will be noted that the pivot 78 passes through the ear 7 7 and the member 78 and into a rectangular block 79, which fits the inside 62 of the yoke 62 and forms a bearing upon which the work clamp is vibrated, and the pivot 78' is located in the rear of the stud and in line with the stud and needle. Thus it will be seen that when the pin 80 moves the member 78 the pivot 78' will be on one side of a supposed line running through the stud 20 and the needle while one side of the button-hole is being formed and on the other ide of the line when the remaining half of the button-hole is being finished, thus giving a more even are relative to the button-hole for the work clamp to swing on than has heretofore been accomplished, as the pivot has always been to one side of the stud and the are which the work clamp has to swing on is from different angles for each side of the button-hole, and this makes a difference in the lay of the stitches on the two sides of the button-hole.

Mounted upon the guide or shield 77 is the knife carrier 72, which has its spring port-ion 84 passing through the openings 85 and 86 of the shield 71 which act as guides for the carrier. The spring portion 84rhas its outer end bent upward, with two ears 87 forming a pair of jaws for the knife 88, which is held by a pin or screw 89. The rear end of the spring portion 84 is enlarged and bent upward, forming a. flange 91 which forms a cam face 92 against which the cam 93 secured to the cam member 30 works. In order to keep the cam face 92 and the cam 98 in contact, I provide a spring 90, which is secured to the shield by the hook 94 formed thereon and to a screw 94 on the knife carrier. The spring has a tendency to always draw the knife backfrom under the needle bar. At a predetermined point the flange 91 forming the cam face 92 is cut away or ends at 95, and is so formed at this point as to have a clearance space 96 to prevent hitting the cam 93 when the spring 90' causes the knife to move quickly back between the strokes of the needle and thus prevent the needle bar from striking the knife several times while it is being moved back from under-the needle bar. This quick movement is caused by the cam 93, which holds the knife forward for the proper time, having an abrupt drop 97, so that while it is revolving onthe stud 20 the point 98 passes the point on the cam 92. The point 98 is so formed as to not interfere with the point 95, and this allows the carrier 72 to move back its full stroke at this point, which is accomplished on one of the upward strokes of the needle bar.

Mounted on the top of the stud 20 and held fixedly in place by dowel pins 99 is a camming plate 100, which works in conjunction with the driving plate 101 secured to the cam member 30 and which causes the revolving disk 102 to revolve in the path of an ellipse relative to the stud 20 and having. its major axis in line with the work clamp and its minor axis transverse therewith and the intersection of its axes to the rear of the stud 20. The revolving of the disk in an elliptical path is caused by its pivot pin 103 hifting its position in the slot 104 as it revolves. The shifting of the pin is caused by the pivoted cam 105 sliding in the shallow slot 106. It will be noted that the slot 104 is deeper than the slot 106; this is to prevent the pin 103fr'om entering the slot 106 at the critical point when the disk 102 is being driven by the driving plate 101, which is connected to the disk 102 by the pivoted cam or block 107, which is free to slide in the slot 108 of the driving plate.

The foregoing movement will be more clearly understood by referring to Fig. 3, where I have indicated by dotted lines the position of the pivoted cams and pins and the starting position of the driving plate for each cycle. T o makeabutton-hole, with the driving plate in the position indicated in dotted lines 109, the cam 107 will be at 110 and the pivot pin 103 at 111 and cam 105 at 112. lVhen the driving plate reaches the position indicated at 113 the cam 107 will be at 114 and its center will represent the end of the minor radius of the ellipse and the cam 105 will be at 115 and the pivot pin 103 will be in the center of the camming plate. hil the driving plate is moving to the position shown in full lines the pivot pin 103 moves along the slot 104 to 116 and the cam 105 returns to the center of the camming plate, and as the driving plate continues its circular movement to the position 109 the earn 105 moves over to 117 and back to the center of camming plate. Mounted upon the revolving disk is an adjustable cam 118 held in position bya stud 119 having a rectangular head 120 which fits the recess 121 and which guides it in its movement. The stud passes through a slot 122 and the cam into a screw cap 123, which causes the cam 118 to bind against the disk 102. This cam moves in an'elliptical path, and the lengths of the axes are changed by the adjustment of the cam on the disk 102 relative to the pin 103. The cam 118 performs the function of the eccentric cam of the patents mentioned in this specification and produces a more satisfactory result.

The cam 118 moves the work clamp forward and back from the stud 20 and in line with the needle through the yoke member 124, which is secured to the work clamp and is provided with a slot 125 in which the cam 118 is located. and as the cam revolves it works against the face 126 first to drive the clamp forward and against the face 127 to draw the clamp back. The yoke member 124 is secured to the work clamp 62 by means of screws 128, and the forward end is bifurcated and bent so as to form bearings for the locking member 129, which is formed of a bent wire having a central portion 130 which acts in the capacity of a hand lever to operate the two end portions 131 which act upon the spring extensions 132 of the upper jaw 63 and which are riveted to the rear yoke 62 of the work clamp.

Mounted on the underside of the base plate 1 (see Figs. 8 and 9) is a spring member 133, which is held in position by the rivets 134 and has an upwardly extending portion 135 which extends through the opening 136 of the pawl plate 14 and into the holes 137 of the, ratchet cam 41. This prevent-s the ratchet cam from being turned backwards by friction of the end 138 of the pawl slipping out of anyone of the holes 137 upon its backward movement after it has revolved the ratchet cam one-tenth of a turn.

The base plate is further bent or formed so as to have a raised portion 139 through the center thereof, upon which the bottom of the work clamp slides and on which is cut the channel or groove 66 for the stripper plate 65, which has an opening 140'somewhat in the shape of a. T. 'Beneath the stripper plate in the base plate is an opening 141 to allow the needle to perform its functions. The raised portion 139 forms a channel or groove 142 (see Fig. 10), which allows the free action of the feed dogs of the sewing machine and raises the device enough to permit the cutting of the cloth without the knife hitting the dogs on its downward stroke.

The operationof the device is very simple. 1

The rear throat plate of the sewing machine is removed and the device is slipped in its 6 of the lever 4. When the attachmentis I first put'on'the machine the screw 54 and lock nut v50 are loosened and the screw 49 turned to bring the knife in line with the needle. The lock nut 50 is then tightened up. This holds the slot 45 in a perfect line with the needle and then the member 52 can be adjusted for any width of vibration for the work clamp. The screw 54 is then tightened and the attachment is ready for operation. It will be understood that after the knife has been once adjusted for the needle the attachment can be removed if desired and put back without the knife being readjusted, and the vibrating movement of the work clamp. can also be changed to take more or less bite when the attachment is adjusted. to make a larger or smaller button-hole, without disturbing the adjustment of the knife.

To make a button-hole, the work clamp v the extreme back positionis reached. The lever 130 of the locking member 129 is then pressed forward, (that is, in the direction of the needle). and forces the ends 131 backwards and thus relieves the pressure of the springs 132, which allows the jaws of the work clamp to open. The cloth is inserted between the jaws and the lever 130 pushed back to its original position, thus causing the upper jaw to force the cloth down into the concave opening in the lower jaw, and at the same time the flanges 143 of the upper prevent the slipping of the cloth on the jaw and thus causes the cloth to be stretched like a drum head. with the work clamp in this position the knife is in the dotted position shown in Fig. 5, and upon running the machine the needle bar strikes the top of the knife and forces it through the cloth each time the needle descends, until the work clamp is almost at its extreme forward position, when the cam 98 is at the point where the point or nose 98 passes the point 95. The spring 90 causes the carrier 72 to move swiftly back and draw the knife out of line with the needle bar before it has time to descend and strike it again, (as shown in full lines in Fig. 5), thus preventing further cutting, and the knife remains in this position until the button-hole is finished.

The pivot 78 is the pivot center upon which the work clamp is oscillated by the vibrator 56. With each upward movement of the needle bar the lever 4 is raised, which in turn swings the pawl plate 14 sufliciently to have the pawl 1558 act on one of the holes 137 of the ratchet cam and revolve it one tenth of a revolution, which causes one of the pointed cam faces 143 to act on one side of the yoke 59 and cause the vibrator to swing to one side on its pivot 51. The face 144 prevents any overthrow of the vibrator. The next stroke of the needle causes one of the faces 143 to act on the opposite side of the yoke 59 and swing it in the opposite direction. This movement of the vibrator causes the work clamp to be oscillated on its pivot 78, such motion being transmitted through the block 60 of the vibrator. Vhile the vibrator is oscilliting the work clamp in one direction or the other with every stroke of the needle to make the needle pass first through the cloth and then through the cut, the elliptical cam is slowly shoving the work clamp forward the length of the buttom-hole, the speed of the forward movement being regulated by the screw 8, which strikes the arm or lever 36 of the friction clutch and forces the ring 31 back a predetermined amount, (upon the downward stroke of the needle). The rear end 10 of the slot 7, upon reaching the arm 36, (on the upward movement of the needle) forces the ring to move forward and the nose 38 to bite into the cam member 30 and cause it and the revolving disk to revolve, which causes the cam 118 to act upon the face 126 of the yoke member 124 and shove the work clamp forward, and when the cam, on the last half of the revolution of the revolving disk,works against the face 127 it causes the work clamp to be drawn backwards. The revolving of the cam member 30 causes the pin 80 to shift its position while the button-hole is being made. This is due to the pin 80 being held relative to the stud 20 by the groove 81 and in the start is in the portion 145 which forms a part of the back end of the button-hole, that is, the part which is furthest from the edge of the ment. The part 146 holds the pin in a posi tion so that the vibrator will vibrate the work clamp up one side of the slit which is being made by the knife for the button-hole. The part 147 then causes the pin 80 to move nearer to the stud 20, and this causes the first part of the loop or eyelet to be made, and the part 148 causes the pin 80 to move the farthest away from the stud, and this causes the semi-circular end of the eyelet to be made. The part 149 causes the pin 80 to move near to the stud, and this causes the completion of the eyelet. The pin is then held in position by the part 100 until the vibrating of the work clamp down the other side of the slit completes the button-hole by the pin going to its original position in the portion 145. It will be understood that whatever distance the pin 80 moves the pivot 78 moves the same amount and at the start of the button-hole is in line with the stud and the needle and to the rear of the stud. When the pin 80 is in the part 145 of the groove 81, the pivot 78 then moves to one side of the stud, while the pin 80 moves into 146, and still further to the side as the pin moves into 147, and when the pin 80 is passing from 147 to 148 the pivot 78 crosses the line of the stud and needle to the extreme opposite side and when the pin 80 enters the part 149 the'pivot 7 8 draws nearer to the stud and finally passes in line with the stud and needle. From the foregoing it will be seen. that the work clamp has a very even movement and will cause the work to pass to and fro under the needle and cause the needle to the stitches very evenly and at right angles to the slit, in stead of obliquely and at two different slants for the opposite sides. This operation forms what is known by the trade as the eyelet or looped button-hole. It will be noted that the cam member 30 revolves an equal distance at each stroke of the nee-' dle, and if the cam 118 were attached directly to the cam member 30 the cam 118 would move in a circule and would pile up too many stitches at the end and make a defective buttorrhole; but by having the cam move in an elliptical path this is ob viated. Of course it is desirable to have the stitches a littlecloser at the back end than on the side, butnot to the extent which would be produced if the circular movement were used.

By referring to the diagrammatic Figs. 36 and 37, it will be seen more clearly the advantages gained by the cam 118 moving in'an elliptical path instead of the circular path. lin these two views I have indicated by the dotted lines 150 the movement of the cam member 30 for every ten strokes of the needle or for every ten stitches, and the point where each dotted line 150 touches the semi-circle 151 indicates where the cam 118 would be; for instance, after thefirst ten stitchesit would have moved from a to I) and the second 'ten stitches from b to 0 and so on until after a hundred and twenty stitches it would be at m and the first half of the button-hole would be finished, and the reverse movement would under the same condition, while the cam 119 is completing the circle, complete the'button-hole.v

The vertical lines 152 represent the forward movement of the cam 118 and the horizontal lines 153 the work clamp, andthe vertical lines 15% represent the forward movement of the work clamp. It will be noted that all of the lines 153 are exactly the same length in both figures, and when thecam 118 moves from a to b ten stitches are crowded into the space between a and 0, and when it moves from Z) to .0 ten are made in the space from 0 to p, and so on, and as the cam 118 moves from mto g each ofthe spaces 155 from n to L increases in length and thus it will be seen that entirely too many stitches are crowded into the space from a too and 0 to 29, while from p to q the stitches would be normal and q to "r would not have sufficient stitches, and a" toe and s to t entirely too few, and the exact reverse condition would exist whle the cam 118 is moving from g to m and the clamp from t to 2. Thus it will be seen that the circular movement gives a very uneven stiching of the button-hole, by piling up too many stitches at the back end and entirely too few at the eyelet end, as the distance of travel or space is greatly increased by the curvature of the eyelet. It will be noted that the work clamp needs to be retarded at the eyelet end in order toallow more'stitches to be made while the eyelet is being formed, and I accomplish this by having the cam 118'move in an elliptical path and by having the minor axis of the ellipse to the rear'of the center of thestud 20, as will be seen by referring 'to Figs. 3, 19 and 37. It will be noted that the cam 118 follows an elliptical path, in

I dicated by the line 156, and when the cam member 30 moves from a to b the cam 118 moves from a to b, and when the cam member has moved to 0 the cam has moved to 0, and so on, and the clamp has moved from a to 0 while the cam member has moved from a to b and the cam from a to Z), and so on. It will be noted that the spaces n,o" are suitable for the back end and the space 0p is almost normal and the spaces pg and gr are normal, and the spaces ri s to yz are gradually shortened in order to compensate for the increased travel or lengthened space to be stitched while the eyelet is being formed, and the work clamp at this point is moving in a line forming a compound'curve instead of a straight line, and the retarding of for ward movement allows the sewing machine to supply sutlicient stitches to make the eyelet have the proper number of stitches to compare with the sides of the button-hole, It is understood that the formation of the other side of the button-hole is the exact reverse of the movementsshown inthe diagrams and that the diagram in Fig. 37 shows the movement of the Workclamp relative to the needle and the stud of the attachment, it being understood that the back end of the button-hole is the beginning of the operation and also the ending of the operation and that the back end is made while the 'work clamp is moving forward from n to 0 and the sides from 0' to t and the eyelet end from 1/ to e, or in other words, in the operation of making the button-hole the work on the button-hole is always in the reverse direction to the move, ment of the work clamp. It will be understood that l have stated for convenience of illustration'that ten stitches are made between each of these divisions; but by regu lating the screw 8 from the foregoing it will be clearly seen that the elliptical movement places the stitches very evenly along the sides of the any number of stitches can be mane between the divisions; and

button-hole and does not overcrowd the ends too much, as the space between it and 0 is greater than between wand 0.

Certain parts of the present mechanism are not claimed herein, but are claimed in applications Serial Nos. 353,107; 353,108;

217,401; 218,076; 352,980; 336,256; 346,235 and M6236. I

What I claim is:

1. In an attachment of the character fixed stud having flattened sides, a slidable member having a rectangular slot therein to 3. In an attachment of the character stated, the combination of stitching mechanism including a needle, a work clamp, a fixed stud having flattened sides, a slidablemem her having a. rectangular slot therein to permit lateral movement of said member with respect to the stud, a shield the front of which forms a stripping plate and the rear of which is in the form of a yoke surroundthe slidable member, an ear for said yoke, pivotal means connecting said ear with said slidable member, which pivot is disposed to the rear of said stud, and means connecting said work clamp member and said shield.

i. In an attachment of the character stated, the combination of stitching mechanism including a needle, a work clamp, a fixed stud having flattened sides, a member having a rectangular slot therein movable laterally with respect to the stud, a cam and pin connection-for moving said member laterally with respect to the stud, a shield the front of which forms a stripping plate and the rear of which is in the form of a yoke surrounding said member, an ear for said yoke, pivotal means connecting said ear with said member, which pivot is disposed to the rear of said stud, and means connecting the said work clamp with said shield.

5. A device as described in claim 4 characterized by said shield having openings therein, a leaf spring passing through said openings and a knife carried by the outer end of said spring.

6. A device as described in claim 5 characterized by said leaf spring being enlarged and bent upward at its inner end to form a cam face and a cam for moving said spring toward the needle.

7. A device as described in claim 6 characterized by means for the rapid return of said spring from the path of travel of the needle.

8. A device as described in claim 7 characterized by said leaf spring having its forward end bent upwardly to form a pair of jaws to receive the knife in vertical position and means for clamping said knife to place.

9. In a buttonhole stitching attachment, the combination of a base, a post on the base, a work-holder mounted to reciprocate to move the work along the path of a 'reciprocating needle, means on said post for reciprocating the work-holder, and a pivot member on which the work-holder is m ounted to vibrate laterally on opposite sides of its path of movement, said pivot being normally located in alinement with the said post and the longitudinal axis of the workholder with the post between the pivot and the worleholder, and a means on said post arranged to shift said pivot member and pivot first to one sid of said axis and then to the other side of said axis whereby to vary the path of vibration of the workholder, on the final portion of the advance, and on the initial portion of the return movement, respectively, to produce an eyelet button -hole effect.

10. In a button-hole stitching attachment, the combination of a base, a post on the base, a work-holder mounted to reciprocate to move the Work along the path of a reciprocating needle, means on said post for reciprocating the work-holder, and a pivot member on which the work-holder is mounted to vibrate laterally on opposite sides of its path of movement, said pivot being located normally in alinement with the said post and the longitudinal axis of the work-holder with the post between the pivot and the work-holder, and a cam o said post arranged to shift said pivot member and pivot first to one side of said axis and then to the other side of said axis whereby to vary the path of vibration of the work-holder, on the final portion of the advance, and on the initial portion of the return movement, respectively, to produce an eyelet button-hole effect.

11. In a; button-hole stitching attachment, the combination of a base, a post on the base, a work-holder mounted to reciprocate,

means for reciprocating the work-holder, a

pivot plate having a slotted portion engag ing said post to slide laterally of the workholder path, a pivot on said plate on which the worleholder is mounted to vibrate on an axis normally in alinement with the post and the longitudinal axis of the work-holder with the post between the pivot and the work-holder, a cam on said post co-operating with said pivot plate whereby to shift said pivot to opposite sides alternately of said longitudinal axis, whereby to vary the path of vibration of the work-holder.

19,. In a button-hole stitching attachment, the combination of a base, a post on the base, a vibrating cam rotatable on said post, a cam frame engaged by said cam to be vibrated, a pivot on the base on which the said frame swings, a block pivoted. on said cam frame, a work-holder slidable along said block to be reciprocated, a cam on said post for reciprocating the work-holder, a guiding frame, a second block pivoted on the guiding frame and slidable on the workholder, a slotted frame slidable'on said post transversely of the work-holder, said guiding frame being pivoted to said slotted frame whereby the guiding frame at said pivot connection will form a pivot for vibration of the ivork lioldei by its said cam frame and cam, said guide frame having a slidable connection with the work-holder, said pivot of vibration of the work-holder being normally in alinement with the .post

the combination of a base, a post on the base, i

a vibrating cam rotatable on said post, a cam frame engaged by said cam to be vibrated, a pivot on the base on which the said frame swings, a block pivoted on said cam frame, a work-holder slidable along said block to be reciprocated, a cam on said post for reciprocating the work-holder, a guiding frame, a second block pivoted on the guiding frame and slidable on the workholder, a slotted frame slidable on said post transversely of the work-holder, said guiding frame being pivoted to said slotted frame whereby the guiding frame said pivot connection will form a pivot for vibration of the work-holder by its said cam frame and cam, said guide frame having a slidable connection with the workholder, said pivot of vibration of the workholder being normally in alinementwith the post and the longitudinal axis of the workholder with the post between the pivot and the worlcholder.

14:. In a button-hole stitching attachment, the combination of a base, a post on the base, a vibrating cam rotatable on said post, a cam frame engaged by said cam to be vibrated, a pivot on the base on which said frame swings, a block pivoted on said cam frame, a work-holder slidable along said block to be reciprocated, a cam on said post for reciprocating the work-holder, a slotted frame slidable on said post transversely of the worlnholder, a guiding frame having an. open portion surrounding said post and said slotted frame, a second block pivoted on the guiding frame and slidable on the workholder, said guiding frame being pivoted to said slotted frame whereby the guiding frame at said pivot connection will form a pivot for vibration of the work-holder by its saidcam frame, said pivot of vibration of the work-holder being normally in alinement with the post and the longitudinal axis of the work-holder with the post between the pivot and the work-holder.

15. In a button-hole stitching attachment, the combination of a base, a post on the base, a work-holder slidable on the base'to be reciprocated, a block slidably connected with the work-holder, means on said post for vibrating said block, a slotted frame slidable on said post transversely of the work-holder, a guiding frame having an open portion surrounding the post and the slotted frame, the guiding frame being pivoted to the slotted frame whereby the guiding frame at said pivot connection will form a pivot for vibra- 'tion of the work-holder by its said vibrating means, a block slidably connected wit-h the work-holder and mounted .on said vibration pivot of the guiding frame, said pivot of vibration of the work-holder being normally in alinement with the post and the axis of the work-holder with the post between the pivot and the work-holder.

16. In a button-hole stitching attachment, the combination of a base, a post on the base, a'workholder slidable on the base to be reciprocat-od, a block slidablyconnected with the work-holder, means on said post for vibrating said block, a slotted frame slidable on said post transversely of the workholder, a guiding frame having an a open portion surrounding the post, and the slotted frame, the guiding frame being pivoted to the slotted frame whereby the guiding frame at said pivot connection will form a pivot for vibration of the workholder by its said vibrating means, a block slidably connected with the work-holder and mounted on said vibration pivot of the guiding frame, said pivot of vibration of the worleholder being normally in alinement with the post and the axis of the workholder with the post between the pivot and the work-holder and a cam on said post arranged to reciprocate said slotted frame.

17. In a button-hole stitching attachment, the combination of a base, a post on the base, a vibrating cam rotatable on said post, a cam frame engaged by said cam to be vibrated, a pivot on the base on which said frame swings, a block pivoted on said cam frame, a work-holder slidable along said block to be recip'rocated, a cam on said post for reciprocating the work-holder, a slotted frame slidable on said post transversely of the work-holder, a guiding frame having an. open portion surrounding said post and said slotted frame, a second block pivoted on the guiding frame and slidable on the workholder, said guiding frame being pivoted to said slotted frame whereby the guiding frame at said pivot connection will form a pivot for vibration of the work-holder, by its said cam frame, said pivot of vibration of the work-holder being normally in alinement with the post and the longitudinal axis of the work-holder with the post between the pivot and the work-holder and a cam on said post arranged to reciprocate said slotted frame.

18. Ina button-hole stitching attachment, the combination of a base, a post on the base, a work-holder mounted to reciprocate, means for reciprocating the work-holder, a pivot plate having a slotted portion engaging said post to slide laterally of the workholder path. a pivot on saidplate on which the work-holder is mounted to vibrate on an axis normally in alinement with the post and 1,467,366 r e g W ith the post betweeri the pivot and the Signed at New York. in the county of Work-holder, a cam on said post co-operating New York and State of New'York, this 5th 19 with said pivot plate whereby to shift said day of November, A. D. 191 9. pivot to opposite sides alternately of said longitudinal axis, whereby to vary the path i ALBERTUS B. MATTINGLY.

of vibration of the Work-holder and a cam Witnesses: I V r on said post arrangedto vibrate said work- CHAS. W. LE RUE, holder. r WM. H. REID. 

